4 ISDN devices

You can connect up to eight devices at the same time, for example a telephone and/or PBX, to the "FON S0" port on the FRITZ!Box by means of an ISDN hub or S0 bus cabling. The FRITZ!Box can provide power to one ISDN device. The other ISDN devices must use their own power supply.

You can use the following ISDN service indicators with devices connected to the "FON S0" port: